Independent solution

How to solve this Coupon Bond Price Anchored by a Zero Bond question

Setup

Setup

Normalize the zero-coupon price to obtain the common n-year discount factor.

vn=6401,000=0.64v^n=\frac{640}{1{,}000}=0.64

Model

Model

Let F be the second face amount. Its annual coupon is one-half of Fi.

640=F[12iani+vn]640=F\left[\frac12 ia_{\overline n|i}+v^n\right]

Compute

Compute

Use the identity that i times a-angle-n equals one minus the maturity discount.

640=F[12(10.64)+0.64]=0.82F640=F\left[\frac12(1-0.64)+0.64\right]=0.82F

Answer

Answer

The face amount is 780.49, which rounds to choice A.

F=780.4878780(A)\boxed{F=780.4878\approx780\quad\text{(A)}}